. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. WAEMING AND VENTILATION. 279 most cases, should be carried directly to the foot of the ventilatiug- shaft. The latter should be placed for its whole length beside the smoke-pipe of the heater, the heat from which will assist the draught. Bui tliis heat will not usually be suflicient to give proper activity to the draught eveu when the external temx>erature is very low, and it will be necessary to keep up a little coal-fire at the bottom
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. WAEMING AND VENTILATION. 279 most cases, should be carried directly to the foot of the ventilatiug- shaft. The latter should be placed for its whole length beside the smoke-pipe of the heater, the heat from which will assist the draught. Bui tliis heat will not usually be suflicient to give proper activity to the draught eveu when the external temx>erature is very low, and it will be necessary to keep up a little coal-fire at the bottom of the ventilating-shaft in a. grate detached from the walls. If local arrangements prevent making the fire at the bottom, it may be made at the floor-level or at the top, keeping the ventilatiiig-opeu- ings, however, in the vertical walls and near the floor. The fresh air, warm or cold, should be admitted near the ceiling, and preferably parallel to its surface. In the season for fires, the air sup- lilied by the heater should be mixed with the external cold air. The jn'oportion of each may be regulated by means of registers easily con- trolled from the interior of the room, so that the mixture may have only the temperature of 85° to 95° at most. The fresh-air openings should be arranged, if possible, along the whole length of the room, or at least be very numerous, and their sec- tion calculated so that the entering air should have a velocity of 40 inches a second, if it is directed horizontally parallel to the ceiling, or 20 inches, if it has a vertical direction. G2. Example. ScJiool in the Rue des Fctits-HoteJs, Paris, (Fig. 15.)—This school-building is intended for two perfectly distinct uses. The ground floor is used for the children's play- room. It is unnecessary to ventilate it, and a single stove is sufhcient to warm it. The second floor is occupied by the primary school kept by the Christian Brothers, and is divided into four rooms, intended for 400 children. Th
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